Train Network Applied Research Based On High-Speed Ethernet Train Backbone Network

The TCN protocol is being used in China’s existing CRH3high-speed train network. The Industrial Ethernet is widely used in various fields. Thus, how to use the Industrial Ethernet to control the high-speed train network has become a hot research all around the world. The Ethernet train backbone (IEC61375-2-5) published by the International Electrotechnical Commission (IEC) provides a new standard for the Ethernet technology’s application on the train network.Industrial computers with PCI bus are used as nodes of the train Ethernet backbone to simulate the data communication between high-speed train vehicles. The network communication model of8marshalling train is built by NetFPGA board with four Gigabit Ethernet ports. The Ethernet train backbone model is constructed based on Ethernet train backbone’s communication and its redundancy function. The main work of the software design includes:(1) the realization of train initialization protocol means marshalling the8train nodes. First it records the results of Mac address in accordance with the HELLO frame. Then the topology frame’s results is used to record each Mac address and the Mac address table is updated. Finally, the entire train network is organized, that means the communication between vehicles has been realized.(2) the redundant switching, i.e. when a node fails, the network can automatically switch from the defective node to the backup node.(3) data optimal scheduling, Train communication data and message data have the priority, streaming data, multimedia and best-effort data have lower-priority.Through the tests, the Ethernet train backbone network, in both the reliability and delay time, throughput and bandwidth utilization, packet loss rate has a better performance. Compared with the WTB network with only1M/s of data rate, the new train backbone network protocols undoubtedly have better connectivity and load capacity. Not only the new train backbone network can ensure transmission of the train control data and real-time response, but also can reserve more bandwidth for multimedia. The Ethernet train backbone will be the development trend of the train network.